Benchmark with iterations shortcut

bmark.rb

require 'benchmark'

def bmark(iterations, benches)
  size = benches.keys.map(&:length).sort.last
  Benchmark.bm(size) do |x|
    benches.each do |key, value|
      x.report(key) do
        iterations.times { value.call }
      end
    end
  end
  nil
end